<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
</head>
<body>
    <script>
        // 数字开头不行
        // var 1a = 10;
        // var a1 = 10;
        // console.log(a1)


        // 关键字和保留字

        var _this = 10;
        var $this = 10;
        // console.log(_this)


        // var this = 10;

        var ThiS = 20;
        // console.log(ThiS)

        var a_$123 = 30;

        // console.log(a_$123)

        var 中文 = 10;
        console.log(中文)

        
    </script>
</body>
</html>